here is my rather simple question:
How do I ensure that incoming calls are rejected immediately so that
- the caller (via mobile network) only hears a busy/congestion signal generated by the network operator or someone along the line but definitely not from Asterisk (as otherwise the call wouldn’t be free for the caller)
To see what kind of user experience I am talking about please dial +27879407450 (call not charged although you require funds on your phone) from your cell phone. While you will get a ussd message in this instance our setup would send a standard sms message to the caller.
Many thanks in advance!